.ctn {
  display: flex;
  align-items: center;
  justify-content: center;
}
.box {
  position: relative;
  background-color: #f1f0f0;
  height: 100vh;
  width: 375px;
  min-width: 375px;
  margin: 0 auto;
}
.box .header {
  height: 50px;
  background-color: #eb4450;
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}
.box .footer {
  background-color: #fff;
  position: absolute;
  width: 100%;
  bottom: 0;
  left: 0;
  height: 50px;
  border-top: 1px solid #ddd;
  display: flex;
}
.box .footer > div {
  height: 100%;
  flex: 1;
  font-size: 14px;
  color: #696666;
  display: flex;
  align-items: center;
  justify-content: center;
}
.box .footer > div .iconfont {
  font-size: 16px;
}
.box .footer .kefu {
  flex-direction: column;
}
.box .footer .share {
  flex-direction: column;
  flex: 0.7;
}
.box .footer .cart {
  flex-direction: column;
}
.box .footer .add-cart {
  background-color: #ffa500;
  color: #fff;
  flex: 1.3;
  font-weight: 700;
  font-size: 15px;
}
.box .footer .buy-now {
  background-color: #eb4450;
  color: #fff;
  flex: 1.3;
  font-weight: 700;
  font-size: 15px;
}
